Definition of extensor noun from the Oxford Advanced American Dictionary

 

extensor

 noun
noun
NAmE//ɪkˈstɛnsər//
 
, NAmE//ɪkˈstɛnsɔr//
 
(also extensor muscle)(anatomy)
 
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a muscle that allows you to make part of your body straight or stretched out compare flexor
See the Oxford Advanced Learner's Dictionary entry: extensor